Curable composition

Abstract

Provided are a curable composition and its use. The curable composition can exhibit excellent processability and workability. The curable composition exhibits excellent light extraction efficiency, hardness, thermal and shock resistance, moisture resistance, gas permeability and adhesiveness, after curing. In addition, the curable composition can provide a cured product that exhibits long-lasting durability and reliability even under harsh conditions, and that does not cause whitening and surface stickiness.

What is claimed is: 
     
       1. A curable composition, comprising:
 a polymerization product comprising a polyorganosiloxane comprising an aryl group and a functional group having an aliphatic unsaturated bond; and 
 a filler in the shape of a hollow fiber, 
 wherein the filler in the shape of the hollow fiber has an aspect ratio of 50 or more. 
 
     
     
       2. The curable composition according to  claim 1 , wherein the polyorganosiloxane comprises a unit of Formula 2 and a unit of Formula 3:
   (R 1 R 2 SiO 2/2 )  [Formula 2]
 
   (R 3   2 SiO 2/2 )  [Formula 3]
 
 wherein R 1  and R 2  are each independently an epoxy group or a monovalent hydrocarbon group, and R 3  is an aryl group. 
 
     
     
       3. The curable composition according to  claim 2 , wherein a ratio (M 2 /M 3 ) of moles (M 2 ) of the unit of Formula 2 with respect to moles (M 3 ) of the unit of Formula 3 is from 0.3 to 2.0. 
     
     
       4. The curable composition according to  claim 1 , wherein the polyorganosiloxane has an average empirical formula of Formula 4:
   (R 4   3 SiO 1/2 ) a (R 4   2 SiO 2/2 ) b (R 4 SiO 3/2 ) c (SiO 4/2 ) d   [Formula 4]
 
 where R 4 's are each independently an epoxy group or a monovalent hydrocarbon group, with the proviso that at least one of R 4 's is an alkenyl group and at least one of R 4 's is an aryl group; and a and b are each a positive number, c and d are each 0 or a positive number, and b/(b+c+d) is 0.7 to 1. 
 
     
     
       5. The curable composition according to  claim 1 , wherein polyorganosiloxane has an average empirical formula of Formula 5:
   (R 5 R 6   2 SiO 1/2 ) e (R 7 R 8 SiO 2/2 ) f (R 9   2 SiO 2/2 ) g (R 10 SiO 3/2 ) h   [Formula 5]
 
 wherein R 5  is a monovalent hydrocarbon group, R 6  is an alkyl group having 1 to 4 carbon atoms, R 7  and R 8  are each independently an alkyl group, an alkenyl group, or an aryl group, R 9  is an aryl group, e is a positive number, f, g, and h are each 0 or a positive number, and (f+g)/(f+g+h) is 0.7 to 1. 
 
     
     
       6. The curable composition according to  claim 1 , wherein the polymerization product is a polymerization product of a mixture comprising a compound of Formula 6: 
       
         
           
           
               
               
           
         
         wherein R d  and R e  are each independently an epoxy group or a monovalent hydrocarbon group, and o is 3 to 6. 
       
     
     
       7. The curable composition according to  claim 1 , wherein the polymerization product is a polymerization product of a mixture comprising a compound of Formula 7 and a compound of Formula 8, 
       
         
           
           
               
               
           
         
         wherein R f  and R g  are each an epoxy group or an alkyl group, R h  and R i  are each an epoxy group of an aryl group, p is a number of 3 to 6, and q is a number of 3 to 6. 
       
     
     
       8. The curable composition according to  claim 6  or  7 , wherein the mixture further comprises a polyorganosiloxane having an average empirical formula of Formula 9 or 10:
   [R j SiO 3/2 ]  [Formula 9]
 
   [R k R l   2 SiO 1/2 ] p [R m SiO 3/2 ] q   [Formula 10]
 
 wherein R j , R k  and R m  are each independently an epoxy group or a monovalent hydrocarbon group, R l  is an alkyl group having 1 to 4 carbon atoms, p is 1 to 3, and q is 1 to 10. 
 
     
     
       9. The curable composition according to  claim 1 , wherein the filler in the shape of the hollow fiber has an inner or outer diameter of a single strand of 0.5 nm to 1,000 nm. 
     
     
       10. The curable composition according to  claim 1 , wherein the filler in the shape of the hollow fiber satisfies Equation 1:
   |X−Y|≦0.1  [Equation 1]
 
 wherein X is a refractive index of the curable composition or a cured product thereof, which does not comprise the filler in the shape of the hollow fiber, and Y is a refractive index of the filler in the shape of the hollow fiber. 
 
     
     
       11. The curable composition according to  claim 10 , wherein the filler in the shape of the hollow fiber has a refractive index of 1.45 or more. 
     
     
       12. The curable composition according to  claim 1 , wherein the filler in the shape of the hollow fiber is an imogolite or a halloysite. 
     
     
       13. The curable composition according to  claim 1 , wherein the filler in the shape of the hollow fiber is comprised in an amount of 0.5 parts by weight to 70 parts by weight relative to 100 parts by weight of the polyorganosiloxane. 
     
     
       14. The curable composition according to  claim 1 , further comprising: a polyorganosiloxane having an average empirical formula of Formula 12:
   (R 11   3 SiO 1/2 ) a (R 11   2 SiO 2/2 ) b (R 11 SiO 3/2 ) c (SiO 4/2 ) d   [Formula 12]
 
 wherein R 11 's are each independently an epoxy group, or a monovalent hydrocarbon group, with the proviso that at least one of R 11 's is an alkenyl group and at least one of R 11 's is an aryl group; and a is a positive number, b is 0 or a positive number, c is a positive number, d is 0 or a positive number, b/(b+c+d) is less than 0.65, and c/(c+d) is 0.8 or more. 
 
     
     
       15. The curable composition according to  claim 1 , further comprising: a compound of Formula 13 or a compound having an average empirical formula of Formula 14:
   R 12   3 SiO(R 12   2 SiO) n SiR 12   3   [Formula 13]
 
   (R 13   3 SiO 1/2 ) a (R 13   2 SiO 2/2 ) b R 13 SiO 3/2 ) c (SiO 2 ) d    
 wherein R 12 's are each independently hydrogen, or a monovalent hydrocarbon group, with the proviso that at least two of R 12 's are hydrogen atoms and at least one of R 12 's is an aryl group; and n is 1 to 100; R 13 's are each independently hydrogen or a monovalent hydrocarbon group, with the proviso that at least two of R 13 's are hydrogen atoms and at least one of R 13 's is an aryl group; and a is a positive number, b is 0 or a positive number, c is a positive number, and d is 0 or a positive number. 
 
     
     
       16. An optical semiconductor encapsulated by the cured curable composition of  claim 1 . 
     
     
       17. A liquid crystal display comprising the optical semiconductor of  claim 16  in a backlight unit. 
     
     
       18. A lighting apparatus comprising the optical semiconductor of  claim 16 .